package com.itheima.reggie.config;

import com.itheima.reggie.common.JacksonObjectMapper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;

import java.util.List;

/**
 * <b><code>WebMvcConfig</code></b>
 * <p/>
 * Description
 * <p/>
 * <b>Creation Time:</b> 2024/3/26 20:45.
 *
 * @author yanjr
 * @since reggie_take_out
 */
@Configuration
@Slf4j
public class WebMvcConfig extends WebMvcConfigurationSupport {
    /**
     * 设置静态资源映射
     * @param registry
     */
    @Override
    protected void addResourceHandlers(ResourceHandlerRegistry registry) {
        log.info("静态资源映射开始");
        registry.addResourceHandler("/backend/**").addResourceLocations("classpath:/backend/");
        registry.addResourceHandler("/front/**").addResourceLocations("classpath:/front/");
        log.info("静态资源映射结束");
    }

    /**
     * 扩展mvc框架的消息转换器
     * 解决前端Long类型数据精度丢失问题
     * @param converters 转换器
     */
    @Override
    protected void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
        log.info("扩展消息转换器");
        // 创建消息转换器对象
        MappingJackson2HttpMessageConverter messageConverter = new MappingJackson2HttpMessageConverter();
        // 设置对象转换器，底层使用Jackson将Java对象转为json
        messageConverter.setObjectMapper(new JacksonObjectMapper());    // JacksonObjectMapper
        // 将上面的小子转换器对象追加到mvc框架的转换器集合中
        // index定义转换器的优先级
        converters.add(0, messageConverter);
    }
}
